in the photoproduction limit, \(Q^2\rightarrow 0\) , provided the integration is performed before the limit is taken.
Since the DA \(\phi _{\pi p}\)  does not vanish at \(\tau =0\)  the integral
(REF ) is in conflict with our study of wide-angle pion photoproduction [1]}
where we found that the \(\phi _{\pi p}\)  contribution to the subprocess amplitudes is zero. This latter result also
implies that the WW approximation is zero in wide-angle photoproduction.
We regard this apparent contradiction between photoproduction and the \(Q^2\rightarrow 0\)  limit of electroproduction as
a relic of the \(k_\perp \) -dependence of the projector (REF ). Although the term (REF ) is
of minor numerical importance we prefer to have a smooth transition from electro- to photoproduction which we
achieve by allowing for a mean-square quark transverse momentum, \(\langle k_\perp ^2\rangle \) , in the propagator
\(\bar{\tau }Q^2-\tau \hat{t}\)  of the relevant term
\(\int _0^1 d\tau \phi _{\pi p}(\tau )\frac{Q^2 \hat{t}}{(Q^2\bar{\tau }-\hat{t}\tau )^2} \longrightarrow \int _0^1 d\tau \phi _{\pi p}(\tau )\frac{Q^2 \hat{t}}{(Q^2\bar{\tau }-\hat{t}\tau + \langle k_\perp ^2\rangle )^2}\,.\) 
